12393
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 14
- Divisor Sum
- 19674
- Proper Divisor Sum (Aliquot Sum)
- 7281
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7776
- Möbius Function
- 0
- Radical
- 51
- Omega Function (Ω)
- 7
- Little Omega Function (ω)
- 2
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 63
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- a(n) = n*(n + 1)*(n^2 - 3*n + 5)/6.at n=17A006484
- Odd numbers divisible by exactly 7 primes (counted with multiplicity).at n=9A046320
- Ordered factorizations with one level of parentheses indexed by prime signatures. A050354(A025487).at n=27A050355
- Expansion of (1-x)/((1-2x)(1+x-x^2)).at n=15A052964
- Numbers n such that n | 3^n + 2^n + 1^n.at n=21A056645
- Numbers n such that n | 11^n + 10^n + 9^n + 8^n + 7^n + 6^n.at n=23A057258
- Numbers k such that k and its reversal are both multiples of 17.at n=40A062906
- Non-palindromic number and its reversal are both multiples of 17.at n=28A062915
- a(n) = 3^n mod n^3.at n=44A066607
- Numbers k such that phi(k) is a perfect 5th power.at n=34A078165
- 3rd binomial transform of (1,2,0,0,0,0,0,0,...).at n=7A081038
- Triangle read by rows giving coefficients of polynomials arising in successive differences of central binomial numbers.at n=22A094796
- Number of walks of length 2n between two nodes at distance 4 in the cycle graph C_10.at n=6A095931
- Least m such that m and m+n are both products of exactly n primes counting multiplicity.at n=7A098515
- Number of distinct products i*j*k*l for 1 <= i <= j <= k <= l <= n.at n=32A100437
- Integers that are Rhonda numbers to more than one base.at n=21A100988
- Numerator of the probability that (2n+1)-dimensional Gaussian random triangle has an obtuse angle.at n=6A102558
- a(0)=1, a(1)=1, a(n) = 9*a(n/2) for even n >= 2, and a(n) = 8*a((n-1)/2) + a((n+1)/2) for odd n >= 3.at n=24A116526
- a(n) = Sum_{k>=0} binomial(n,5*k+1).at n=16A133476
- a(n) = Sum_{k >= 0} binomial(n,5*k).at n=16A139398